The tekmarNet® 2 House Control 403 is designed to operate all of the mechanical equipment in a residential hydronic heating system, coordinating their operation through network communication. It can be used in applications ranging from a single zone of baseboard with an on/off boiler, to multiple fan coils, mixed radiant floor heating zones, and a modulating/condensing boiler. This control regulates up to two heating water temperatures through Outdoor Temperature Reset and Indoor Temperature Feedback. It is capable of controlling a single on/off, two stage, or modulating boiler, a mixing device, Domestic Hot Water, setpoint loads, 4 on-board zone pumps, and can expand up to 24 zones in total for each space heating water temperature.

• Only requires 2 Wires Per Zone, Four 115 V (ac) powered zone outputs
• For use with tekmarNet® 2 thermostats only, tN4 expansion terminals
• Outdoor temperature reset, indoor temperature feedback
• Warm weather shut down, zone synchronization
• DHW post purge, DHW control
• DHW priority (optional), setpoint operation
• Expandable up to 48 zones, single on/off, two stage, or modulating boiler control
• Variable speed, floating action, or proportional mixing control, automatic boiler differential
• Exercising, boiler protection